Upgrading to mountain lion, deleting everything I have on Lion

I have so much rubish on my mac at the moment, its going quite slowly and often crashes. I want to upgrade to mountain lion, with everything being deleted, and everything I have done/changed on lion to be undone (basically like new). How do i go about doing this?

Obviously, make sure you first archive anything such as photos and documents that you do not wish to permanently erase.
Boot OS X Recovery and choose Disk Utility from the OS X Utilities screen. Choose the volume containing Lion from the left column - usually it is named "Macintosh HD" - then click Erase. This will take only a moment.
When it finishes, quit Disk Utility, and choose Reinstall Mac OS X from the Utilities screen. You will be asked for the Apple ID you used to purchase Lion, if it was not already installed on your Mac when you bought it. When it completes the Mac's Setup Assistant will appear in which you configure a new account. Don't be surprised when your personal information such as name, address, and phone numbers are automatically populated. These are gathered from Apple using your Apple ID, not from any information on your Mac.
After you log in to your account for the first time, purchase Mountain Lion from the App Store and install it.
That's it!

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